Apparently, it's designed as another way to control what's on the screen. You twist the controller, the dude on the screen twists the throttle, things like that. But it seems like it would have pretty limited uses, and would probably get on my nerves quickly. If the Wii has taught me anything, it's that I'm perfectly fine with traditional controllers and get sick of gimmicky crap very quickly.
Coroloft via NotCot]